Fault Finding - Potterton Promax Ultra Combi 24 Installation And Service Manual

Table Of Error Codes
09 Gas Valve Connection Cable
15 Gas Valve Fault
20 Central Heating NTC Fault
28 Flue NTC Fault
Central Heating Return NTC Fault
40
55 Calibration Required
109 Pre-circulation Fault
110 Safety Thermostat Operated
Primary System Water Pressure Too High
117
118 Primary System Water Pressure Too Low
125 Circulation Fault (Primary)
Flame Failure
128
130 Flue NTC Operated
133 Interruption Of Gas Supply or Flame Failure
134 Elapsed Time - Gas Valve Open Without Gas
Interruption Of Gas Supply (Internal Error)
135
154 Flow/Return Sensor Temperature Test
160 Fan or Fan Wiring Fault
270 Circulation Fault (Dry Fire)
321 Hot Water NTC Fault
384 False Flame
The button can be pressed so that the display shows the following
information:-
1 press - '00' alternates with Sub-Code (only when fault on boiler) or '000'
2 presses - '01' alternates with CH Temperature
3 presses - '02' alternates with Outside Temperature (where Sensor fitted)
4 presses - '03' alternates with DHW Temperature
5 presses - '04' alternates with DHW Temperature
6 presses - '05' alternates with System Water Pressure
7 presses - '06' alternates with Return Temperature
8 presses - '04' alternates with Flue Temperature
9 presses - '05' alternates with Heat Exchanger Temperature
'Service Due' Message
1. After 11 months operation the 'Service Due' message will
be shown on the boiler display. (If the installation has been
subject to prolonged electrical isolation or power cuts this
period may be longer than 11 months)
2. Once the service has been completed satisfactorily the
'Service Due' message can be reset or de-activated.
To Reset
4. Press &
'22'
through until is displayed. Press
5. Press to scroll to
press to return the display to normal.
To De-activate
6. Press &
'22'
through until is displayed. Press
'22'
7. Press until
Using scroll through to
'25'
8. Press until
then press to return the display to normal.
© Baxi Heating UK Ltd 2016
for 6 seconds. Using scroll
.
'15'
. Confirm with then
for 6 seconds. Using scroll
.
is displayed again. Press .
'50'
. Press .
is displayed. Confirm with

17.0 Fault Finding

17.1 Initial Fault Finding Checks
1. Check that gas, water and electrical supplies are available at
the boiler.
2. Electrical supply = 230V ~ 50 Hz.
3. The preferred minimum gas pressure is 20mb (NG) 37mb
(LPG).
4. Carry out electrical system checks, i.e. Earth Continuity,
Resistance to Earth, Short Circuit and Polarity with a suitable
meter.
NOTE: These checks must be repeated after any servicing
or fault finding.
7. Ensure all external controls are calling for heat and check all
external and internal fuses. Before any servicing or replacement
of parts, ensure the gas and electrical supplies are isolated.
17.2 Error Codes
1. If a fault occurs on the boiler an error code may be shown
by the facia display.
2. The codes are a flashing number, either two or three digit,
preceded by the symbol :-
followed by 20, 28, 40, 160 or 321 indicates possible faulty
components.
followed by
55 (after replacing R.D.S.) indicates calibration
required (Section 14.2).
110 indicates overheat of the primary system water.
117 is displayed when the primary water pressure is greater
than 2.7 bar.
118 is displayed when the primary water pressure is less than
0.5 bar.
133, 134 and 135 indicate that the gas supply has been
interrupted, ignition has failed or the flame has not been detected.
128 is displayed if there has been a flame failure during normal
operation.
125 is displayed in either of two situations:-
i) If between 15 and 30 seconds of the burner lighting the boiler
temperature has not changed by 1°C.
ii) If within 10 minutes of the burner lighting the boiler actual
temperature twice exceeds the selected temperature by 30°.
In these instances poor primary circulation is indicated.
3. By pressing the 'Reset' button for 1 to 3 seconds when
110, 125, 133, 134, 135, 09, 15, 128 & 384 are displayed it
is possible to relight the boiler.
4. If this does not have any effect, or the codes are displayed
regularly further investigation is required.
47